Hi! First tap the green flag. After that, its almost just like regular cookie clicker and tap the cookie to get cookies, and tap the arrow to open the shop. To close the shop, you can tap the background. And ya.
Thank you to Julien Thiennot/Orteil for inspiring me to create cookie clicker! Also, credit to @JamiePotato for showing me that you can make cookie clicker in scratch. Try out his cookie clicker here. https://scratch.mit.edu/projects/127689014/